Heating apparatus



w. 0. MERRILL. HEATING 'APPARATU S. APPLICATION FILED FEB. 14, l9i6.

Patented Dec. 23,1919

2 SHEETS-SHEET I. m: k \a ziness:

wfc. MERRILL.

HEATING APPARATUS: APPLICATION F|L ED FEB- 14. I916- 1 325,952. Patented 7 Dec. 23, 1919 2 SHEETS-SHEET 2.

wz/ness En strains PA WILLIS c. MER ILL, or BOSTON, massaonosh'rrs, assrciivon, BY Mnsmi Assmrt' MENTS,TO THE MERRILL PROCESS COMPANY, OF BOSTON, MASSACHUSETTS, A GOR- I'OBATION OF -MASSAGHUSETTS.

' 'HEA'TING ArPAnA'rus."

To all-whom it may concern:

Be it known that I, WILLIS Boston, in the county of Suffolk and State of Massachusetts, have invented certain new 5 "and useful Improvements in HeatingApparatus of whichthefollowingisa s'pecification. v

My,1nvent1on relates to new and useful 1mprovements in heating apparatus and es- 1 '0 'pecially adapted to control qr regulate the flow of fuelto heaters employing gas, fuel oil or other burners, and in which apparatus a circulating heating fluid or liquid medium is employed for heating materials or heat units of said circulating heating fluid culated in a suitable conduit. .The main object of my invention is to provide an apparatus adapted upon the retarding or stoppage of the circulation ,of the circulating heating fluid or liquid medium, owing to trouble\with the motor and pump or for any-other reason, to automatically cut ofl" the fuel supply, and thereby prevent any increase in temperature of the circulating'heating fluid or liquid medium which will gradually f fall. intemperature. owing to the cutting off of the fuel supply-to the so burner of the heater.

This,an d other objects are accomplished by the apparatus hereinafter described and illustrated in the. drawings.

In, the accompanying drawings I which 85' illustrate a constructionembodying my mvention:

' 1 is a apparatusemploying my invention to cut off the supply of 'fuel upon the retarding- '40 or stoppingof the pump; and motor therebypreventing any increase in temperature in;

. "the-heater thereby avoiding damage or 'mmediumgorto the apparatus. 46 Fig 2 is a side elevation partly/1n s e c' tion of the valve mechanism for controlling juryto the circulating heating fluid or liquid i the valve in the -fuel oil supply pipe andshowingthe valve open to fuel to'the burner.

allow a flow of s pp y peH-c1osedw t ff t flow bf fuel tot e burner. A

substance by the radiation thereby of the side elevation of a heating v Fig- 3;. is a sim lar-view to Fig 2 and showing the controlling valve in the fuel 0'11 Specification. Letters Patent. 'li at 23, 19.

Application filed February 14, 1916. Serial m 3 I v mechanism and valve for controlling the flow of fuel to the'burner-open.

Fig. 5 is a side elevation of the valve. .mechamsm and valve for controlling the flow of fuel to the burner closed. 1; Fig 6 is a modification of the controlling flow of fuel 'to the burner. V

Flg; 7 is a similar view to Fig.- 6 of the modification and showing the controlling" valve in the fuel. supply pipe closed to cut off the flow of-fuel from the burner.

Like letters of reference refer to like parts throughout the several views.

I'have illustrated my invention as applied to a heating-apparatus in which acirculating heating fluld or liquid medium, as a mineral oil, is employed as the heating agent, and this oil which is supplied to an expansion or supply tank 32 feedsdown the pipe 69 past the hand valve 31 to the pi e 42 thence into the force pump A, throng the pipe 30, through the coil B located in the heater 28 and then out through the pipe29,

to the hollow bearing 74 to the calender roll 49 and out through the hollow bearing 7 5 supported on the posts 72'and base 50,

. and then the said circulating heating fluid 0r liquid medium passes through the pipe 42 back to the pump A'thus forming acomplete inclosed 'heatingconduit. In this con--.

duit is circulated under pressure by the pump A a heating fluid or liquid medium,

preferably a mineral oil, having a boilingpoint' above 212 .F. and a high carbonizing polnt, so that the temperature of this mineral oil may be raised in the heater B to high temperatures without ,carbonization,

say 500 F, or higher, owing to the rapid circulation thereof by-the pump A, which forced circulation causes new surfaces of the heating fluid or liquidmedium to be continuously presented to the ,heate1 28, and

in'the contmiied circulationof said heating fluid or liquid medium the heat units there- "of are uniformly distributed to the material or substances under treatment. This forcedcirculationwith the rapid absorption and transmission of theheat units prevents the'jcarbonization of"the circulating heating fluid or liquidmedium and consequent injury tothe circulating fluid or damage to v the apparatus. lhe pump A is driven by an electric motor- 41 receiving its power through the Wires 38 and 39, in which circuit is interposed a rheostat 43 in turn connected with the panel 44 by the \vires'47 and 48 and controlled by a hand switch 69 controlling the main circuit through the wires 45 and 46. Themotor 41 and pump A are supportedon a suitable base 40.

The burner 11 receives its fuel supply from the tank 1 through the pipes 18 and 16 controlled by the hand valves 17 and 12 and in said pipe 16 is a valve controller 14 in which is located the magnets D which, when the apparatus is in operation, is energized by the branch electric circuit through the wires 26 and 27 secured by the contact screw 66 to the valve controller 14.

- Weight 5 is secured in This closed circuit through the wires 26 and 27 energizes the magnets D and lifts the armature E with the valve rod H and its valve to an'upper position, as shown in Fig. 2, to allow a clear flow of fuel through the pipe 16 .and port M in the,

'valve casing 13. The movements of the armature E and valve rod H are guided by a yoke consisting of the vertical rods' F which pass through guides G on opposlte sides of the valve casing 13 and carry on their lower end a weight 5 provided with lugs P through which rods F pass and said place by the lock nuts K...

Now if the circuit to theinotor 41 should fail and the motor and pump stop, or their normal operation be interfered with for any reason, then the branch circuit through the wires 26 and 27 would be broken and the magnets D become denergized allowing the armature E and weight 5 to drop from the osition shown in Fig. 2 to that shown in .ig. 3, thereby closing the .valve 60' and cuttingofi' the fuel supply through the pipe 16 to the burner 11.

As the valve 60 and weight 5 drop the contact fingers L and N engage one another and close the circuit through the wire 20, held in place by the contact screw 67,- and the battery 21, thereby starting'the bell 23 to g've an alarm to the attendant who may sto the alarm by operating the hand switch 4. A source of air is supplied throu h the pipe 8 to the burner 11 through the l -joint 10 in the pipel6; and is controlled by a hand valve-9 and a valve controller 6 of similar construction to thevalve controller 14. (Figs. 1,2 and 3) for the fuel supply pipe 16', and operates in identically the same In nner as said valve controller 14,: so

that -wh nthemotor and pump are running and e apparatus is in operation the valves in the valvecontrollers14 and 6 are held open b the, branch electric circuits from the main circuit and the supply of air and fuel flows freely to the burner 11, and upon the breaking of the circuits, as above. described, the

sluggish owing to the retarding or stoppage I of'the pump and is not raised in temperature to a dangerous point, but-decreases by the lack of the supply of fuel to the burner 11 and the cooling off of the heater by radiation to the atmosphere, so that no carbonization of this circulating heating fluid or liquid medium with the consequent damage due to crystallization of the conduit takes place, and as the. apparatus is thus automatically stopped and the temperature lowered any further liability of damage or injury to theapparatus is avoided.

When the circuit is reestablished and the motor and pump ar in operation, the circuits to the valve controllers 6 and 14'areclosed, and the controlling valves therein are automaticallyopened to allowa free flow of the fuel and air to the burner 11 for the heating of'the oil again started in .circulation by the pump A upon the closing of these branch circuits 26, 27, 24and 25.

. From all of the foregoing it will be understood that upon the motor and pump starting in the operation of the apparatus, both the valves controlling the airandfuel upon the stoppage of the motor and pump both 'the valves in the air supply and fuel supply pipes are automatically closed.

so that in case the valve in the fuel supply pipe should stick or for any other reason not work, the one in the air supply pipe would Work and cut off the necessary air for the combustion at the burner, and also cut ofi the air pressure to thetank 1 for forcing the fuel supply to the burner 11' through the pipes 18 and 16. t

In Figs. 6 and 7 I have shown the modisupply and mechanism for o crating the supply are automatically opened, and that ll )5 While I have shown two valve controllers.

'fication of the valve controlling the fuel same, and this modification-(1i ers from the valve controller 14 in that, the valve'in the fuel or air supply pipes is opened by a manual operation upon the restarting of the pump' and the motor. and the purpose is to provide an extra safeguard so that the valves controlling the fuel and air supply pipes may not accidentally be opened until the pump and motor are 1n proper work ing order. In this construction, when the circuit is again made and the motor and pump are operating the magnets 51 are-energized by the branch electric circuit through the wires 26 and 27 secured by the contact screw 66 to the valve controller 76, and this closed circuit holds' the armature 64 with the roll56 on the upper end of the said armature 64 supporting the weight 58 as shown and holding the valve 60 in an open position with the passage 61 in the valve casing 1% open (Fig. 6) and affording a clear flow 0 the fuel through the pipe 16. A spring 53 secured on one end to the side of the valve controller 7 6 by the pin and at its other end to the upper end of the armature 64 tends to pull the armature 64 away'from the magnets 51 (Figs. 6 and 7) into contact with a stop in 57 to limit its movement. Now if the circuit to-the motor; should fail and the motor or pump stop, the branch circuit 26 and 27 would be broken and the magnets 51 denergized permitting the spring 53 to pull the armature 64 from the posi tion shown in Fig. 6 to that shown in Fig. 7, thereby allowing the weight 58 to drop supply pipe 16 (Fig. 7 As'the-weight 58 drops the contact fingers 62 and 63 secured respectively to the wires 19 and 20 by the contact pieces '68 and 67 engage one another and close the circuit through the wires 19 and 20, the battery 21 and wire 22 and bell. 23, thereby starting the bell '23 .to give an alarm to the attendant, who may stopthe alarm by operating the hand switch 74. After the motor -and pump are again in opera-- tion the valve 60 in the fuel supply pipe 16 may be raised by operating the handle 15,

when the parts move from the positions shown in 7 to'the positions shown in Fig.6, so as to provide for a flow of air and fuel to the burner 11 and break the secondary circuit to the alarm bell 23, thus putting the apparatus in condition to be operated ashereinbefore described upon the next stoppage of-the pump or -motor.,

If for instance by reason of some extra-.

neous matter, like a piece of scale from the pipe; or for other cause obstructing the operation of the motor or pump, the circulating heating fluid orliquid medium should be caused to stop circulating or to; run sluggishly and an overload thereby be imposed upon the motor, or for any otherreason the I i motor shouldbe arrested or stopped, damage roviding a fuse 52 inmay be avoided by the main line 46 whlch will be adapted to blow dutwhen the current reaches a predetermined strength and thereby break the circuit to the motorand also the circuits to the valve controllers. 14 and 6 and start the bell 23 to give the alarm, so that when the motor or pump, or both, stop either from the j failure of'the main circuit or from causes 'as above stated then the fuel supply to the burner is automatically cut off during the stoppage of the pump and motor, and upon the restarting of the apparatus the controlling valves in the air andfuel' supply pipes for the burner are either automatically In this apparatus it is intended to have no built up pressure, so that the circulating oil isfree to expand and by placing thefeed pipe from the expansion tank 32 onthe suctionside of the pump A, expansion of'the circulating oil is provided for without interfering with the circulation of the same,

and any lack of circulating oil is supplied by the tank 32 to completethe circulation.

Qtherwise if the feed pipe from the ex pans1on tank 32 were connected on the pressure side ofthe pump A, any pressure that might occur would tend to drive the circulating oil up into the expansion tank 32 rather than through the conduit containing the circulating heating fluid or liquid medium. and with it the valve 60 closmg the fuel tinuous'bonduit in which the circulating heating liquid is circulated by operating the hand valve' 34-01 automatic relief may be provided through the pipes 36 and 70 and automatic relief valve35 of anysuch excess pressure due to any cause interfering with the normal circulation of the circulating heating liquid.

While I have. shown and described my invention as applied'toheating apparatus in which a heating fluid or liquid medium as a mineral oil, is circulated as a heating medium for treating materials by the radiation of its heat units, yet it will be understood that my invention might be applied to other forms of apparatus usinga heating fluid or fuel supply otherthan a-mineral' oil. And

further while I have shown m invention as applied to an apparatus for eating calender rolls, yet it-will be understood that it I nay be equally well adapted to other heatmg devices for other-uses and purposes, such as-heatingrmetal surfaces, press'ure rolls and cylinders, burnishers, cloth driers, vulcaniz ers, heating. and liquefyingasphalt, bituminous or other materials requiring heat for their liquefaction, also inthe arts of distilling, brewing, dyeing, soap making, sugar makin and for any other uses and purposes" where eat'is required and'especially heat at hi h temperatures.

ile I have illustrated and described m invention, as applied toa machine where 6 electric power is used, yet it will be understood that it may be used with apparatus employingany other source of power in which cases suitable mechanical devices would be provided which upon'the stoppage of the pump or motor, or both from any cause would operate to automatically cut off the supply of fuel to the burner or both the supply of fuel and air to the burner if desired to cause a falling off of the temperature in the heater and thereby prevent dam-v age and injury to the apparatus, and upon the restarting of the apparatusthese valves would be either automatically or manually opened as desired.

Having thus'described the nature of my invention and set forth a construction embodying the same, what I claim 'as new and desireto secure by Letters Patent of the United States, is:

1. In a heating apparatus, a source ofheater, a valve controller for said valve, an

electric circuit for operating said'motor and for controllingvsaid valve controller: to open said valve and allow a flow of fuel to the heater during the operation of the motor and upon the motor becon'iing inert to allow said fuel supply controlling valve to close automatically and cut offthe fuel supply to the, heater and upon the restarting of the motor to operate said'valve controller to open automatically said fuel supply control ling valve to permit a su )ply of fuel to 'the heater, and an alarm 2M apted to be automatically set off upon the lstoppage of the motor.

2. In a heating apparatus, a source ofheating mineral oil, a conduit through which said heating mineral 011 is clrculated, a heater for heat-mg said heatlng mineral oil as it circulates through said conduit, :1

sourceof fuel supply for said heater, means for circulating under pressure the said heating mineral oil to absorb the heat units of the heater and uniformly distribute the same to the material under treatment, a motor for operating said circulating means, a valve controlling the supply of fuel to. said heater, a valve controller for said valve, an electric circuit'for operating said motor and for controlling said valve controller to open said valve and allow a flow of fuel to the heater during the operation of the motor and upon the motor-becoit1ing inert to allow said fuel supply controlling valve to close automatically and cut off the fuel supply to the heater and upon the restarting of the motor to operate said valve controller to open automatically said fuel supply controlling valve to permit a supply of fuel to the heater, and an alarm adapted to be automatically set off upon the stoppage of the motor.

In testimony whereof I have signed my name to this specification.

wittis c; MERRILL. 

